package com.filter;

import com.model.User;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginJudgeFilter implements javax.servlet.Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        if(user == null){
            String tip="请先登陆";
            request.setAttribute("tip", tip);
            RequestDispatcher dispatcher = request.getRequestDispatcher("/jsp/login.jsp");
            dispatcher.forward(request, response);
        }
        else {
            filterChain.doFilter(servletRequest,servletResponse);
        }
    }

    @Override
    public void destroy() {
    }
}
